伤寒沙门菌fljB∷lacZ变异株的制备 |
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引用本文: | 朱超望,;茅凌翔,;徐顺高,;黄新祥.伤寒沙门菌fljB∷lacZ变异株的制备[J].镇江医学院学报,2008(2):93-96. |
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作者姓名: | 朱超望 ;茅凌翔 ;徐顺高 ;黄新祥 |
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作者单位: | [1]江苏大学医学技术学院生物化学研究室,江苏镇江212013 |
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基金项目: | 国家自然科学基金资助项目(30570088);江苏大学高级人才科研启动项目(04JDG008) |
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摘 要: | 目的:为研究伤寒沙门菌z66鞭毛抗原编码基因fliB的表达调节机制,建立该fljB基因的β-半乳糖苷酶基因(1acZ)插入变异株。方法:采用自杀质粒介导的同源重组方法进行制备。设计加接茚nI和SalI的特异性引物,用PCR扩增获得舻基因的上、下游同源性DNA片段,并与用Kpn I和Sal I酶切pSV-β-半乳糖苷酶载体(pSV-β-galactosidase vector)的片段定向连接,将连接片段克隆至自杀质粒pGMBl51,再通过电击法将重组质粒转入伤寒沙门菌,在含X-Gal的蔗糖平板上筛选获得同源重组的变异株。结果:经筛选获得阳性克隆,经PCR及序列分析证实,fljB基因中的763bp被3550bp的lacZ片段替代。结论:成功构建伤寒沙门菌flj∷lacZ突变株,为进一步研究fljB基因表达调节机制奠定了基础。
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关 键 词: | 伤寒沙门菌 舻基因 β-半乳糖苷酶基因 基因融合 |
Construction of a fljB∷lacZ mutant of Salmonella enterica serovar Typhi |
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Institution: | ZHU Chao-wang, MAO Ling-xiang, XU Shun-gao, HUANG Xin-xiang (Department of Biochemistry, School of Medical Technology, Jiangsu University, Zhenjiang Jiangsu 212013, China) |
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Abstract: | Objective: To study the mechanisms of expressional mutant strain of Salmonella enterica serovar Typhi was constructed. regulation of fljB: z66, the fljB∷lacZ Methods: The mutant strain was prepared by the method of homologous recombination mediated by suicide plasmid. The special primers with Kpn I and Sal I sites respectively were designed, the upper-and down-stream homologous fragments of the fljB gene were amplified by PCR, a lacZ cassette from the pSV-β-galactosidase vector was linked with the upper-and doun-stream homologous fragments respectively. The resulting product was inserted via Sma I sites into the suicide plasmid pGMB151. S. enterica serovar Typhi were transformed with recombinant plasmid by electroporation transformation, selected in the sucrose plate containing X-Gal. Homologous recombinants were screened by PCR. Results: A 3 550 bp insertion in fljB gene was confirmed instead of 763 bp deletion by PCR and sequencing analysis. Conclusion: The mutant with fljB::lacZ have been successfully constructed and it was a foundation to study the expression and regulation mechanism of fljB gene in S. Typhi. |
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Keywords: | Salmonella enterica serovar Typhi fljB lacZ gene fusion |
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